About Power-On Self-Test (Post) Diagnostics - Sun Microsystems Ultra Enterprise 450 Owner's Manual

About Power-On Self-Test (POST)
Diagnostics
The POST diagnostic code resides in flash PROM on the main logic board. It runs
whenever the system is turned on or when a system reset is issued. POST tests the
following system components:
CPU modules
Memory modules
NVRAM
Main logic board
POST reports its test results via LEDs located on the system keyboard and on the
system front panel. It also displays diagnostic and error messages on a console
terminal, if one is attached to the system. See "Error Indications" on page 393 for
more information about LEDs and error messages.
For information about running POST, see:
"How to Use POST Diagnostics" on page 373
372 Ultra Enterprise 450 Server Owner's Guide • July 1997